A machine take materials to build, even if it is biological, the sacrifice of material and energy yields what it produces. In the case with a human the benefit is a brand new human being, this is not a loss it is a gain.<quoted text>We're NOT talking about a born child so quite trying to dance around the issue. We're talking about the fetus el'stupido. You're an embarrassment to the pro-choice movement. Now answer the question, and THIS time maybe don't let your bias blind you.
If you want to look at the loss of 9 months nutritional value and ennrgy expended to the mother (BTW which she compensates herself for by eating more),
then think what a good son can do to compensate this trivial amount in nutrients in the years to come. In work and provisions.
The extension of your genes by the ToE is the benefit. Your legacy continues. This is called Parental investment the biggest reward however is failure to reproduce leads to the end of your bloodline.